diff --git a/cad/gmsh/files/patch-Geo__CustomContainer.h b/cad/gmsh/files/patch-Geo__CustomContainer.h
new file mode 100644
index 000000000000..c4538ad6980d
--- /dev/null
+++ b/cad/gmsh/files/patch-Geo__CustomContainer.h
@@ -0,0 +1,10 @@
+--- Geo/CustomContainer.h.orig	2010-10-15 09:35:00.000000000 -0400
++++ Geo/CustomContainer.h	2011-08-09 05:12:35.000000000 -0400
+@@ -8,6 +8,7 @@
+ #ifndef _CUSTOMCONTAINER_H_
+ #define _CUSTOMCONTAINER_H_
+ 
++#include <cstddef>
+ #include <cstdlib>
+ #include <cstring>
+